JP2004270774A

JP2004270774A - Pulley with bearing

Info

Publication number: JP2004270774A
Application number: JP2003061021A
Authority: JP
Inventors: Kunihiro Yamaguchi; 晋弘山口
Original assignee: Koyo Seiko Co Ltd
Current assignee: Koyo Seiko Co Ltd
Priority date: 2003-03-07
Filing date: 2003-03-07
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made pulley with a bearing that can keep circulality of an outer ring in press fitting of the bearing outer ring, has high heat dissipation efficiency, and can prevent creeping. <P>SOLUTION: The pulley 2 integrally having an outside cylindrical part 21 and inside cylindrical part 23 working as a belt transfer section and an annular disk section 22 for interconnecting them is made of a metal sheet. A plurality of recessed grooves 23b or projecting parts 23d extending axially are formed circumferentially on the inner peripheral surface 23a of the inside cylindrical part. Otherwise, the outside cylindrical part and inside cylindrical part working as the belt transfer section and the annular disk section for interconnecting them are molded of the metal sheet integrally with the synthetic resin. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、軸受を備えた金属製或いは合成樹脂製プーリであって、軸受嵌合面に高精度加工を必要とせず、回転中発生する熱のこもりやクリープを防止し、軸受寿命の延長を図ることの出来る軸受付プーリに関する。
【０００２】
【従来の技術】
内燃機関等では、冷却用ポンプや発電用ジェネレータ等の補機を駆動する場合、該内燃機関から動力を取り出し、ベルト駆動によってこれらの補機を回転駆動する。このようなベルト駆動において、特にアイドラプーリは、ラジアル玉軸受が使用されるが、通常、ベルト転送部となる外側円筒部と、内側円筒部とこれらを連結する環状円板部とを一体的に備えたコの字形とし、前記内側円筒部内周面に外輪回転のラジアル玉軸受外輪を嵌合させて製作される。或いは軸受の外輪外周面に合成樹脂をインサート成形により射出成形した樹脂一体型の軸受付き軸受付樹脂製プーリとして製作される。このような軸受付きプーリは、内燃機関周囲に配置され、組み込み時の外輪変形による真円度の低下、回転中の熱の発生による潤滑剤の劣化、クリープ等による寿命低下等が問題となっている。
【０００３】
従来から軸受付プーリの上記各問題を解決するため種々の提案がなされている。例えば、図１３に示すように、Ｖベルト用溝１１ａを設けたリム部１１と軸受１４の外輪１４ａを嵌合するボス部１３とこれらリム部１１とボス部１３とを連結する環状円板部１２とを備えたアイドラプーリ１０において、前記ボス部１３の内周面に凹凸状の溝１３ａ１３ａ，・・・を軸方向に数条設けて軸受外輪３１の接触圧を緩和するようにしたものが提案されている（特許文献１参照）。或いは、図１４（Ａ）に示すように、補機用の軸受付きプーリはエンジン回りの高温環境下で使用される上、摩擦摺動による摩擦熱から生じる潤滑油の劣化等により寿命の低下を来していたので、熱による劣化を防止する手段として、Ｖ溝１５ａ，１５ａ，・・を設けたプーリ１５の内周面１５ｂに縦溝１５ｃを周回りに設け、この内周面に軸受１６を嵌合したものが提案されている。尚、図１４（Ｂ）は、プーリ１５の内周面を示す一部斜視図である（特許文献２参照）。
【０００４】
【特許文献１】
特開平０８−０３５５５５
【特許文献２】
特開２００２−０３９３３３
【０００５】
【発明が解決しようとする課題】
従来の軸受付プーリは、軸受を圧入嵌合することや熱膨張による寸法変化に対応させるため高精度加工されたプーリ内径が必要とされてきた。一方、プレス加工による板金製プーリでは、高精度が出ないため軸受外輪を圧入する際「締め代」がきつくなり外輪変形が生じて真円度が良くなかったり、また、圧入スキマを緩くすれば異音が発生したり温度上昇によりクリープが生じる、という問題がある。更に、熱によるグリースの劣化を防止するためには放熱性の向上が必要であるが、合成樹脂の放熱性は金属製に比較して良くないうえ、高温環境下で使用されると軸受外輪との間のクリープが生じ易いという問題がある。
【０００６】
この発明は、上記する課題に対処するためになされたものであり、軸受外輪圧入に際して外輪の真円度を維持することができ、放熱効果に優れ、クリープも防止することのできる板金製或いは合成樹脂製の軸受付きプーリを提供することを目的としている。
【０００７】
【課題を解決するための手段】
即ち、この発明は、上記する課題を解決するために、請求項１に記載の発明は、ベルト転送部となる外側円筒部と内側円筒部とこれらを連結する環状円板部とを一体的に備えたプーリと、前記内側円筒部内周面に嵌合される軸受とを有する軸受付プーリにおいて、
前記外側円筒部と内側円筒部とこれらを連結する環状円板部とを板金製とし、該内側円筒部内周面に、軸方向に延びる凹状溝または凸条部を周方向に複数形成したことを特徴とするものである。
【０００８】
また、請求項２に記載の発明は、ベルト転送部となる外側円筒部と内側円筒部とこれらを連結する環状円板部とを一体的に備えたプーリと、前記内側円筒部内周面に嵌合される軸受とを有する軸受付プーリにおいて、
前記ベルト転送部となる外側円筒部と内側円筒部とこれらを連結する環状円板部とを合成樹脂により一体形成すると共に、前記外側円筒部の側端面から環状円板部の側端面を介して前記内側円筒部内周面に金属板を一体的に形成し、該金属板の内側円筒部内周面に、軸方向に延びる凹状溝または凸状部を周方向に複数形成したことを特徴とするものである。
【０００９】
また、請求項３に記載の発明は、前記合成樹脂の外側円筒部の側端面から環状円板部の側端面を介して前記内側円筒部内周面に一体的に形成した金属板の前記環状円板部の反対側に、軸受の側端面を覆うように鍔部を形成したことを特徴とするものである。
【００１０】
【発明の実施の形態】
以下、この発明の具体的な実施の形態について図面を参照して説明する。
図１は、この発明の軸受付プーリの第１の実施の形態を示すものであって、軸方向の一部断面図である。この軸受付プーリ１は、ベルト転送部となるＶ溝２１ａ，２１ａ，・・・を形成した外側円筒部（リム部）２１と、内側円筒部２３と、これらを連結する環状円板部２２と、を一体的に備えたプーリ２と、前記内側円筒部２３の内周面２３ａに嵌合される軸受３と、で構成される。この場合、前記内側円筒部２３の内周面２３ａには、軸受３の外輪３１が圧入嵌合される。これらの外側円筒部２１と内側円筒部２３とこれらを連結する環状円板部２２とは、板金によるプレス加工により製作される。前記内側円筒部２３の端部（環状円板部２２とは反対側端部）には、鍔部２４が形成され、軸受３を覆うようにしてある。
【００１１】
図２（Ａ）は、前記軸受付プーリ１を構成するプーリ２の軸方向一部断面図であり、図２（Ｂ）は、図２（Ａ）のＡーＡ矢視断面図である。前記内側円筒部２３の内周面２３ａには、軸方向に延びる凹状溝２３ｂ，２３ｂ，・・が周方向に複数条形成されている。これらの凹状溝２３ｂ，２３ｂ，・・は、ローラ転造加工或いは鍛造加工或いは切削加工等いずれの加工方法によっても良い。このように、前記内側円筒部２３の内周面に凹状溝２３ｂを形成すると、該内側円筒部２３に外輪３１を圧入する際、図３に示すように、該外輪３１の外周面は、凹状溝２３ｂと凹状溝２３ｂとの間の台部２３ｃ，２３ｃ，・・で接触し、凹状溝２３ｂとは接触しないので、その分圧入の際の力が小さくて済む。従って、プーリ２の内側円筒部内周面２３ａに凹状溝２３ｂ，２３ｂ，・・を周方向に複数条形成すれば、軸受外輪３１を圧入する際比較的楽に圧入嵌合することができる。そして、多少内側円筒部２３の真円度が悪くても、圧入作業が楽になる。また、軸受外輪３１にかかる荷重も緩和されるので、外輪３１の軌道面の真円度に影響を及ぼすことが殆どなくなる。
【００１２】
図４は、この発明の軸受付プーリの第２の実施の形態を示すものであって、図２（Ａ）のＡーＡ矢視断面図と同じ方向から見た図である。この実施の形態は、前記プーリ２の内側円筒部２３の内周面２３ａに設ける凹状溝２３ｂ，２３ｂ，・・の代わりに、該内側円筒部２３の内周面２３ａには、凸条部２３ｄ，２３ｄ，・・が周方向に複数条形成される場合を示している。この場合、これらの凸条部２３ｄは、ローラ転造加工或いは鍛造加工或いは切削加工等いずれの加工方法によっても良い。このように、内側円筒部２３の内周面に凸条部２３ｄを形成すると、該内側円筒部２３に外輪３１を圧入する際、図５に示すように、該外輪３１の外周面は、第１の実施の形態の場合とは逆に、周方向に設けた凸条部２３ｄ，２３ｄ，・・の表面で接触し、これら凸条部２３ｄと凸条部２３ｄとの間の凹状溝部２３ｅ，２３ｅ，・・とは接触しないので、その分圧入力が小さくて済む。従って、この実施の形態の場合もプーリ２の内側円筒部内周面２３ａに凸条部２３ｄ，２３ｄ，・・を周方向に形成し、軸受外輪３１を圧入する際比較的楽に圧入嵌合することができる。そして、多少内側円筒部２３の真円度が悪くても、圧入作業が楽になる。また、軸受外輪３１にかかる荷重も緩和されるので、外輪３１の軌道面の真円度に影響を及ぼすことが殆どない。
【００１３】
図６は、この発明の軸受付プーリの第３の実施の形態を示すものであって、図２（Ａ）のＡーＡ矢視断面図と同じ方向から見た図である。この実施の形態は、前記プーリ２の内側円筒部２３の内周面２３ａに設ける凹状溝部２３ｂや凸条部２３ｄを周方向複数形成する代わりに、該内側円筒部２３の内周面２３ａには、波形２３ｆを周方向に形成される場合を示している。この場合の波形の２３ｆはローラ転造加工或いは鍛造加工或いはプレス加工等のいずれの加工方法によっても良い。この場合も、内側円筒部２３に外輪３１を圧入する際、該外輪３１の外周面は、波形２３ｆの突起部分のみで接触するので、その分圧入力が小さくて済む。従って、この実施の形態の場合もプーリ２の内側円筒部内周面２３ａに軸受外輪３１を圧入する際比較的楽に圧入嵌合することができる。そして、多少内側円筒部２３の真円度が悪くても、圧入作業が楽になる。また、軸受外輪３１にかかる荷重も緩和されるので、外輪３１の軌道面の真円度に影響を及ぼすことが殆どない。
【００１４】
次に、図７は、この発明の第４の実施の形態を示すものであって、軸方向の一部断面図である。この軸受付プーリ１は、ベルト転送部となるＶ溝４１ａ，４１ａ，・・・を形成した外側円筒部（リム部）４１と、内側円筒部４３と、これらを連結する環状円板部４２とを合成樹脂により一体形成したプーリ４と、前記外側円筒部４１の側端面の一部と環状円板部４２の側端面を覆う鍔部５ｂと、この環状円板部４２から内側円筒部４３の内周面４３ａを覆うように一体にモールド成形した円筒部５ｃと、軸受３の一端部を覆うように曲折して設けられた鍔部５ｄとより成る金属板５と、該金属板５の円筒部５ｃの内周面５ａに嵌合される軸受３と、で構成されている。この場合、前記金属板５の円筒部５ｃの内周面５ａには、軸受３の外輪３１が圧入嵌合される。この実施の形態では、Ｖ溝４１ａ，４１ａ，・・を形成する合成樹脂製の外側円筒部４１と内側円筒部４３と環状円板部４２を設けているので、強度を維持するためこれら外側円筒部４１と内側円筒部４３との間には、周方向数ヶ所に補強リブ４４が設けられている。
【００１５】
図８（Ａ）は、前記軸受付プーリ１を構成するプーリ４の軸方向一部断面図であり、図８（Ｂ）は、図８（Ａ）のＢーＢ矢視断面図である。前記合成樹脂製内側円筒部４３と一体にモールドされた金属板５の円筒部５ｃの内周面５ａには、軸方向に延びる凹状溝５ｅ，５ｅ，・・が周方向に複数条形成されている。これらの凹状溝５ｅは、プレス加工、ローラ転造加工或いは鍛造加工或いは切削加工等いずれの加工方法によっても良い。金属板５の円筒部５ｃの内周面５ａに凹状溝５ｅを形成すると、該円筒部５ｃに外輪３１を圧入する際、図９に示すように、該外輪３１の外周面は、凹状溝５ｅと凹状溝５ｅとの間の台部５ｆ，５ｆ，・・で接触し、凹状溝部５ｅとは接触しないので、その分圧入の際の力が小さくて済む。従って、金属板５の円筒部の内周面５ａに凹状溝５ｅ，５ｅ，・・を周方向に複数形成し、軸受外輪３１を圧入する際には比較的楽に圧入嵌合することができる。そして、多少円筒部５ｃの真円度が悪くても、圧入作業が楽になる。また、軸受外輪３１にかかる荷重も緩和されるので、外輪３１の軌道面の真円度に影響を及ぼすことが殆どなくなる。
【００１６】
この第４の実施の形態では、特に、Ｖ溝４１ａ，４１ａ，・・を形成する外側円筒部４１と、内側円筒部４３と、これらを連結する環状円板部４２と、金属板５とを合成樹脂により一体的にモールド成形したプーリ４として、金属板５の円筒部５ｃの内周面５ａに軸受３の外輪３１を圧入嵌合するものであるが、一般に金属板でＶ溝加工するのは高価となるが、合成樹脂を用いればＶ溝４１ａの加工コストを低減することができる。また、合成樹脂では放熱効果があまり期待出来ないが、金属板を利用すると放熱効果が大きいこと等両者の持つ特徴を生かしたプーリとするものである。
【００１７】
また、前記金属板５の前記円筒部５ｃには、環状円板部４２端面の反対側に、軸受３の端面にかかるよう鍔部５ｄが形成されている。この鍔部５ｄにより軸受３の内部に水分や塵埃等が侵入するのを防止することができる。即ち、従来は、軸受３の近傍にシール機能を強化するため、スリンガー（図示省略）を設けることが多いが、このように金属板５の端部に鍔部ｄを形成することによりスリンガーとしての機能を持たせることが可能である。
【００１８】
図１０は、この発明の軸受付プーリの第５の実施の形態を示すものであって、図８（Ａ）のＢーＢ矢視断面図と同じ方向から見た図である。この実施の形態は、図４に示す場合と同様に、前記プーリ４の金属板５の円筒部５ｃの内周面５ａに設ける凹状溝５ｅ，５ｅ，・・の代わりに、凸条部５ｇ，５ｇ，・・を周方向に形成するものである。この場合も、円筒部５ｃに外輪３１を圧入する際、図１１に示すように、該外輪３１の外周面は、凸条部５ｇ，５ｇ，・・で接触し、凹状溝部５ｈ，５ｈ，・・とは接触しないので、その分圧入の際の力が小さくて済む。従って、軸受外輪３１を圧入する際比較的楽に圧入嵌合することができる。そして、多少内側円筒部５ｃの真円度が悪くても、圧入作業が楽になる。また、軸受外輪３１にかかる荷重も緩和されるので、外輪３１の軌道面の真円度に影響を及ぼすことが殆どなくなる。
【００１９】
更に、図１２は、この発明の軸受付プーリの第６の実施の形態を示すものであって、図８（Ａ）のＢーＢ矢視断面図と同じ方向から見た図である。この実施の形態は、図２に示す場合と同様に、前記プーリ４の金属板５の内側円筒部５ｃの内周面５ａに設ける凹状溝部５ｅや凸条部５ｇの代わりに、波形５ｉ，５ｉ，・・を周方向に形成される場合を示している。この場合も、詳細は省略するが、軸受外輪３１を圧入する際比較的楽に圧入嵌合することができる等効果は、第３の実施の形態の場合と同様である。
【００２０】
【発明の効果】
以上、詳述したように、この発明の軸受付プーリによれば、軸受を嵌合すべきプーリの内周面に高精度の加工を必要としない。そして、多少加工寸法の精度が悪くても幅広い内径寸法公差に対応することができる。また、高温環境下で使用されるプーリであってもクリープを防止することができる。更に、特に、金属板とモールドさせた合成樹脂製プーリは、放熱効果が良くなり軸受寿命の低下を抑制することができる。そしてまた、金属板に設けた鍔部はスリンガー効果を発揮するので水分や塵埃等の侵入を有効に阻止して軸受寿命の向上にも貢献する。
【図面の簡単な説明】
【図１】この発明の軸受付プーリの第１の実施の形態を示すものであって、軸方向の一部断面図である。
【図２】図２（Ａ）は、この発明の軸受付プーリを構成するプーリの軸方向一部断面図であり、図２（Ｂ）は、図２（Ａ）のＡーＡ矢視断面図である。
【図３】この発明の軸受付プーリの第１の実施の形態を示すものであって、プーリの内側円筒部に軸受外輪を嵌合する場合の該内側円筒部の内周面と軸受外輪との接触状態を示す図である。
【図４】この発明の軸受付プーリの第２の実施の形態を示すものであって、図２（Ａ）のＡーＡ矢視断面図と同じ方向から見た図である。
【図５】この発明の軸受付プーリの第２の実施の形態を示すものであって、プーリの内側円筒部に軸受外輪を嵌合する場合の該内側円筒部の内周面と軸受外輪との接触状態を示す図である。
【図６】この発明の軸受付プーリの第３の実施の形態を示すものであって、図２（Ａ）のＡーＡ矢視断面図と同じ方向から見た図である。
【図７】この発明の軸受付プーリの第４の実施の形態を示すものであって、軸方向の一部断面図である。
【図８】図８（Ａ）は、この発明の軸受付プーリの第４の実施の形態のプーリの軸方向一部断面図であり、図８（Ｂ）は、図８（Ａ）のＢーＢ矢視断面図である。
【図９】この発明の軸受付プーリの第４の実施の形態を示すものであって、プーリの内側円筒部に軸受外輪を嵌合する場合の該内側円筒部の内周面と軸受外輪との接触状態を示す図である。
【図１０】この発明の軸受付プーリの第５の実施の形態を示すものであって、図６（Ａ）のＢーＢ矢視断面図と同じ方向から見た図である。
【図１１】この発明の軸受付プーリの第５の実施の形態を示すものであって、プーリの内側円筒部に軸受外輪を嵌合する場合の該内側円筒部の内周面と軸受外輪との接触状態を示す図である。
【図１２】この発明の軸受付プーリの第６の実施の形態を示すものであって、図６（Ａ）のＢーＢ矢視断面図と同じ方向から見た図である。
【図１３】従来の軸受付プーリを構成するプーリの軸方向一部断面図である。
【図１４】図１４（Ａ）は、従来の軸受付プーリを構成するプーリの軸方向一部断面図であり、図１４Ｂ）は、プーリ１５の内周面を示す一部斜視図である。
【符号の説明】
１軸受付プーリ
２プーリ
２１外側円筒部
２２環状円板部
２３内側円筒部
２３ａ内側円筒部内周面
２３ｂ凹状溝
２３ｃ台部
２３ｄ凸条部
２３ｅ凹状溝部
２３ｆ波形
２４鍔部
３軸受
３１軸受外輪
４プーリ
４１外側円筒部
４２環状円板部
４３内側円筒部
５金属板
５ａ金属板の円筒部の内周面
５ｂ鍔部
５ｃ金属板の円筒部
５ｄ鍔部
５ｅ凹状溝
５ｆ台部
５ｇ凸条部
５ｈ凹状溝部
５ｉ波形[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is a metal or synthetic resin pulley provided with a bearing, which does not require high-precision machining of a bearing fitting surface, prevents heat buildup and creep generated during rotation, and prolongs bearing life. It relates to a pulley with a bearing that can be achieved.
[0002]
[Prior art]
In an internal combustion engine or the like, when driving accessories such as a cooling pump and a generator for power generation, power is taken out from the internal combustion engine and these accessories are driven to rotate by belt driving. In such a belt drive, in particular, a radial ball bearing is used for an idler pulley. Usually, an outer cylindrical portion serving as a belt transfer portion, an inner cylindrical portion, and an annular disk portion connecting these are integrally formed. It is manufactured by fitting a radial ball bearing outer ring of outer ring rotation into the inner peripheral surface of the inner cylindrical portion. Alternatively, it is manufactured as a resin-integrated bearing-mounted resin pulley in which a synthetic resin is injection-molded on the outer peripheral surface of an outer ring of a bearing by insert molding. Such a pulley with a bearing is arranged around an internal combustion engine, and causes problems such as a reduction in roundness due to deformation of an outer ring at the time of assembly, deterioration of a lubricant due to generation of heat during rotation, and a reduction in life due to creep and the like. I have.
[0003]
Conventionally, various proposals have been made to solve the above problems of the pulley with a bearing. For example, as shown in FIG. 13, a boss portion 13 for fitting a rim portion 11 provided with a V-belt groove 11a and an outer ring 14a of a bearing 14, and an annular disk portion connecting the rim portion 11 and the boss portion 13 12 are provided on the inner peripheral surface of the boss portion 13 with several grooves 13a, 13a,... In the axial direction to relieve the contact pressure of the bearing outer ring 31. It has been proposed (see Patent Document 1). Alternatively, as shown in FIG. 14 (A), a pulley with a bearing for an auxiliary machine is used in a high-temperature environment around an engine, and its life is shortened due to deterioration of lubricating oil caused by frictional heat caused by frictional sliding. As a means for preventing deterioration due to heat, a vertical groove 15c is provided around the inner peripheral surface 15b of the pulley 15 provided with V-grooves 15a, 15a,. Have been proposed. FIG. 14B is a partial perspective view showing the inner peripheral surface of the pulley 15 (see Patent Document 2).
[0004]
[Patent Document 1]
JP-A-08-035555
[Patent Document 2]
JP-A-2002-039333
[0005]
[Problems to be solved by the invention]
Conventional pulleys with bearings require a highly-precision machined inner diameter of the pulley in order to cope with a dimensional change due to press-fitting of a bearing or thermal expansion. On the other hand, in the case of sheet metal pulleys made by press working, since high accuracy is not obtained, the `` tightening margin '' is tight when press-fitting the bearing outer ring, the outer ring deforms and the roundness is not good, or if the press-fit clearance is loosened There is a problem that abnormal noise occurs and creep occurs due to a rise in temperature. Furthermore, in order to prevent grease from deteriorating due to heat, it is necessary to improve heat dissipation.However, the heat dissipation of synthetic resin is not as good as that of metal, and when used in a high temperature environment, it may not be possible to use the outer ring of the bearing. There is a problem that creep is easily generated during the heat treatment.
[0006]
The present invention has been made in order to address the above-described problems, and is capable of maintaining the roundness of an outer ring at the time of press-fitting an outer ring of a bearing, is excellent in a heat dissipation effect, and is made of a sheet metal or a composite which can prevent creep. An object of the present invention is to provide a pulley with a bearing made of resin.
[0007]
[Means for Solving the Problems]
That is, in order to solve the above-mentioned problem, the invention according to claim 1 integrally forms an outer cylindrical portion and an inner cylindrical portion serving as a belt transfer portion and an annular disk portion connecting these. A pulley provided with the bearing and a bearing fitted to the inner peripheral surface of the inner cylindrical portion.
The outer cylindrical portion, the inner cylindrical portion and the annular disk portion connecting them are made of sheet metal, and a plurality of axially extending concave grooves or ridges are formed in the inner circumferential surface of the inner cylindrical portion. It is a feature.
[0008]
According to a second aspect of the present invention, there is provided a pulley integrally provided with an outer cylindrical portion serving as a belt transfer portion, an inner cylindrical portion, and an annular disk portion connecting the outer cylindrical portion and the inner cylindrical portion, and fitted on the inner peripheral surface of the inner cylindrical portion. And a bearing pulley having a combined bearing.
The outer cylindrical portion and the inner cylindrical portion serving as the belt transfer portion and the annular disk portion connecting them are integrally formed with synthetic resin, and from the side end surface of the outer cylindrical portion through the side end surface of the annular disk portion. A metal plate is integrally formed on the inner peripheral surface of the inner cylindrical portion, and a plurality of concave grooves or convex portions extending in the axial direction are formed on the inner peripheral surface of the inner cylindrical portion of the metal plate in the circumferential direction. It is.
[0009]
The invention according to claim 3 is characterized in that the annular circular metal plate is integrally formed on the inner peripheral surface of the inner cylindrical portion from the side end surface of the outer cylindrical portion of the synthetic resin via the side end surface of the annular disk portion. A flange portion is formed on the opposite side of the plate portion so as to cover a side end surface of the bearing.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of a pulley with a bearing according to the present invention, and is a partial sectional view in the axial direction. The pulley with bearing 1 includes an outer cylindrical portion (rim portion) 21 having V grooves 21a, 21a,... Serving as a belt transfer portion, an inner cylindrical portion 23, and an annular disk portion 22 connecting these. , And a bearing 3 fitted to the inner peripheral surface 23 a of the inner cylindrical portion 23. In this case, the outer ring 31 of the bearing 3 is press-fitted to the inner peripheral surface 23a of the inner cylindrical portion 23. The outer cylindrical portion 21 and the inner cylindrical portion 23 and the annular disk portion 22 connecting them are manufactured by press working with sheet metal. A flange portion 24 is formed at an end of the inner cylindrical portion 23 (an end opposite to the annular disk portion 22) so as to cover the bearing 3.
[0011]
FIG. 2A is a partial cross-sectional view in the axial direction of a pulley 2 constituting the pulley 1 with a bearing, and FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A. A plurality of concave grooves 23b, 23b,... Extending in the axial direction are formed in the inner peripheral surface 23a of the inner cylindrical portion 23 in the circumferential direction. These concave grooves 23b, 23b,... May be formed by any processing method such as roller rolling, forging, or cutting. As described above, when the concave groove 23b is formed on the inner peripheral surface of the inner cylindrical portion 23, when the outer ring 31 is press-fitted into the inner cylindrical portion 23, the outer peripheral surface of the outer ring 31 has a concave shape as shown in FIG. Since the bases 23c, 23c,... Between the groove 23b and the concave groove 23b make contact and do not come into contact with the concave groove 23b, the force at the time of press-fitting is small. Therefore, if a plurality of concave grooves 23b are formed in the inner peripheral surface 23a of the inner cylindrical portion of the pulley 2 in the circumferential direction, the outer ring 31 can be press-fitted relatively easily when the bearing outer ring 31 is press-fitted. And, even if the roundness of the inner cylindrical portion 23 is somewhat poor, the press-fitting work becomes easy. Further, since the load applied to the bearing outer ring 31 is also reduced, it hardly affects the roundness of the raceway surface of the outer ring 31.
[0012]
FIG. 4 shows a second embodiment of a pulley with a bearing according to the present invention, and is a view as seen from the same direction as the sectional view taken along the line AA of FIG. 2 (A). In this embodiment, instead of the concave grooves 23b provided on the inner peripheral surface 23a of the inner cylindrical portion 23 of the pulley 2, the inner peripheral surface 23a of the inner cylindrical portion 23 has a ridge 23d. , 23d,... Are formed in a plurality in the circumferential direction. In this case, these projections 23d may be formed by any processing method such as roller rolling, forging, or cutting. As described above, when the convex portion 23d is formed on the inner peripheral surface of the inner cylindrical portion 23, when the outer ring 31 is press-fitted into the inner cylindrical portion 23, as shown in FIG. Contrary to the case of the first embodiment, contact is made on the surface of the ridges 23d, 23d,... Provided in the circumferential direction, and the concave grooves 23e, 23c between these ridges 23d, 23d. 23e,... Do not come in contact with each other, so that the partial pressure input can be small. Therefore, also in the case of this embodiment, the ridges 23d, 23d,... Are formed on the inner peripheral surface 23a of the inner cylindrical portion of the pulley 2 in the circumferential direction so that the bearing outer ring 31 is press-fitted relatively easily when press-fitted. Can be. And, even if the roundness of the inner cylindrical portion 23 is somewhat poor, the press-fitting work becomes easy. Further, since the load applied to the bearing outer ring 31 is reduced, the roundness of the raceway surface of the outer ring 31 is hardly affected.
[0013]
FIG. 6 shows a third embodiment of a pulley with a bearing according to the present invention, and is a view as seen from the same direction as the sectional view taken along the line AA of FIG. 2 (A). In this embodiment, instead of forming a plurality of concave grooves 23b and convex ridges 23d provided on the inner peripheral surface 23a of the inner cylindrical portion 23 of the pulley 2 in the circumferential direction, the inner peripheral surface 23a of the inner cylindrical portion 23 has , The waveform 23f is formed in the circumferential direction. In this case, the waveform 23f may be formed by any processing method such as roller rolling, forging, or pressing. Also in this case, when the outer ring 31 is press-fitted into the inner cylindrical portion 23, the outer peripheral surface of the outer ring 31 comes into contact only with the projection portion of the waveform 23f, so that the partial pressure input can be small. Therefore, also in this embodiment, when the bearing outer ring 31 is press-fitted into the inner peripheral surface 23a of the inner cylindrical portion of the pulley 2, the press-fitting can be performed relatively easily. And, even if the roundness of the inner cylindrical portion 23 is somewhat poor, the press-fitting work becomes easy. Further, since the load applied to the bearing outer ring 31 is reduced, the roundness of the raceway surface of the outer ring 31 is hardly affected.
[0014]
Next, FIG. 7 shows a fourth embodiment of the present invention and is a partial sectional view in the axial direction. The pulley with bearing 1 includes an outer cylindrical portion (rim portion) 41 having V grooves 41a, 41a,... Serving as a belt transfer portion, an inner cylindrical portion 43, and an annular disk portion 42 connecting these. A pulley 4 integrally formed of a synthetic resin, a flange 5b that covers a part of the side end surface of the outer cylindrical portion 41 and the side end surface of the annular disk portion 42, and the inner cylindrical portion 43 from the annular disk portion 42. A metal plate 5 including a cylindrical portion 5c integrally molded so as to cover the inner peripheral surface 43a, and a flange portion 5d provided to bend so as to cover one end of the bearing 3; And the bearing 3 fitted to the inner peripheral surface 5a of the portion 5c. In this case, the outer race 31 of the bearing 3 is press-fitted to the inner peripheral surface 5a of the cylindrical portion 5c of the metal plate 5. In this embodiment, the outer cylindrical portion 41, the inner cylindrical portion 43, and the annular disk portion 42 made of synthetic resin for forming the V-shaped grooves 41a, 41a,... Are provided. Between the portion 41 and the inner cylindrical portion 43, reinforcing ribs 44 are provided at several places in the circumferential direction.
[0015]
FIG. 8A is a partial sectional view in the axial direction of a pulley 4 constituting the pulley 1 with a bearing, and FIG. 8B is a sectional view taken along the line BB in FIG. 8A. A plurality of axially extending concave grooves 5e are formed in the inner peripheral surface 5a of the cylindrical portion 5c of the metal plate 5 integrally molded with the synthetic resin inner cylindrical portion 43 in the circumferential direction. I have. These concave grooves 5e may be formed by any processing method such as pressing, roller rolling, forging or cutting. When the concave groove 5e is formed in the inner peripheral surface 5a of the cylindrical portion 5c of the metal plate 5, when the outer ring 31 is pressed into the cylindrical portion 5c, as shown in FIG. , 5b, 5c,..., And not in contact with the concave groove 5e, so that the force required for press-fitting is small. Therefore, a plurality of concave grooves 5e, 5e,... Are formed in the inner peripheral surface 5a of the cylindrical portion of the metal plate 5 in the circumferential direction, and when the bearing outer ring 31 is press-fitted, it can be relatively easily press-fitted. Then, even if the roundness of the cylindrical portion 5c is somewhat poor, the press-fitting work becomes easy. Further, since the load applied to the bearing outer ring 31 is also reduced, it hardly affects the roundness of the raceway surface of the outer ring 31.
[0016]
In the fourth embodiment, in particular, the outer cylindrical portion 41 forming the V-shaped grooves 41a, 41a,..., The inner cylindrical portion 43, the annular disk portion 42 connecting these, and the metal plate 5 are formed. As the pulley 4 integrally molded with a synthetic resin, the outer ring 31 of the bearing 3 is press-fitted on the inner peripheral surface 5a of the cylindrical portion 5c of the metal plate 5. Generally, a V-groove is formed by the metal plate. However, if synthetic resin is used, the processing cost of the V-shaped groove 41a can be reduced. Although a synthetic resin cannot be expected to have a significant heat radiation effect, a pulley that utilizes the characteristics of both, such as the use of a metal plate, has a large heat radiation effect.
[0017]
A flange 5 d is formed on the cylindrical portion 5 c of the metal plate 5 on the opposite side to the end surface of the annular disk portion 42 so as to cover the end surface of the bearing 3. The flange 5d can prevent moisture, dust and the like from entering the inside of the bearing 3. That is, conventionally, a slinger (not shown) is often provided in the vicinity of the bearing 3 in order to enhance the sealing function. However, by forming the flange d at the end of the metal plate 5 as described above, the slinger can be used. It is possible to have a function.
[0018]
FIG. 10 shows a fifth embodiment of a bearing-equipped pulley according to the present invention, and is a view as viewed from the same direction as the sectional view taken along the line BB in FIG. 8A. In this embodiment, similarly to the case shown in FIG. 4, instead of the concave grooves 5e provided on the inner peripheral surface 5a of the cylindrical portion 5c of the metal plate 5 of the pulley 4, instead of the convex grooves 5g, 5g,... Are formed in the circumferential direction. Also in this case, when the outer ring 31 is press-fitted into the cylindrical portion 5c, as shown in FIG. 11, the outer peripheral surface of the outer ring 31 comes into contact with the ridges 5g, 5g,..., And the concave grooves 5h, 5h,.・ Because it does not contact with, the force at the time of press-fitting is small. Therefore, when the bearing outer ring 31 is press-fitted, it can be relatively easily press-fitted. And, even if the roundness of the inner cylindrical portion 5c is somewhat poor, the press-fitting work becomes easier. Further, since the load applied to the bearing outer ring 31 is also reduced, it hardly affects the roundness of the raceway surface of the outer ring 31.
[0019]
Further, FIG. 12 shows a sixth embodiment of a pulley with a bearing according to the present invention, and is a view as seen from the same direction as the sectional view taken along the line BB of FIG. 8A. In this embodiment, as in the case shown in FIG. 2, instead of the concave grooves 5e and the ridges 5g provided on the inner peripheral surface 5a of the inner cylindrical portion 5c of the metal plate 5 of the pulley 4, waveforms 5i and 5i are provided. ,... Are formed in the circumferential direction. Also in this case, although the details are omitted, the effect that the bearing outer ring 31 can be press-fitted relatively easily when the bearing outer ring 31 is press-fitted is the same as that of the third embodiment.
[0020]
【The invention's effect】
As described above in detail, according to the pulley with a bearing of the present invention, high-precision machining is not required for the inner peripheral surface of the pulley to which the bearing is to be fitted. And even if the accuracy of the processing dimensions is somewhat poor, it is possible to cope with a wide range of inner diameter tolerances. Further, even if the pulley is used in a high-temperature environment, creep can be prevented. Furthermore, in particular, a synthetic resin pulley molded with a metal plate can improve the heat radiation effect and can suppress a reduction in the bearing life. In addition, since the flange provided on the metal plate exhibits a slinger effect, it effectively prevents moisture, dust and the like from entering and contributes to the improvement of the bearing life.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of a pulley with a bearing according to the present invention, and is a partial cross-sectional view in the axial direction.
2 (A) is a partial sectional view in the axial direction of a pulley constituting a pulley with a bearing of the present invention, and FIG. 2 (B) is a sectional view taken along the line AA of FIG. 2 (A). FIG.
FIG. 3 shows a first embodiment of a pulley with a bearing according to the present invention, wherein an inner peripheral surface of the inner cylindrical portion, a bearing outer ring and a bearing outer ring when a bearing outer ring is fitted to the inner cylindrical portion of the pulley. It is a figure which shows the contact state of.
FIG. 4 shows a second embodiment of a pulley with a bearing according to the present invention, and is a view seen from the same direction as a cross-sectional view taken along the line AA of FIG. 2 (A).
FIG. 5 shows a second embodiment of a pulley with a bearing according to the present invention, wherein an inner peripheral surface of the inner cylindrical portion, a bearing outer ring, and a bearing outer ring when the outer ring of the bearing is fitted to the inner cylindrical portion of the pulley. It is a figure which shows the contact state of.
6 shows a third embodiment of a pulley with a bearing according to the present invention, and is a view as seen from the same direction as a sectional view taken along the line AA of FIG. 2 (A).
FIG. 7 shows a fourth embodiment of a pulley with a bearing according to the present invention, and is a partial sectional view in the axial direction.
FIG. 8A is a partial sectional view in the axial direction of a pulley according to a fourth embodiment of the present invention, and FIG. 8B is a sectional view taken along a line B in FIG. FIG.
FIG. 9 shows a fourth embodiment of a pulley with a bearing according to the present invention, wherein the inner peripheral surface of the inner cylindrical portion and the outer ring of the bearing when the outer ring of the bearing is fitted to the inner cylindrical portion of the pulley. It is a figure which shows the contact state of.
10 shows a fifth embodiment of a pulley with a bearing of the present invention, and is a view as seen from the same direction as a sectional view taken along the line BB of FIG. 6 (A).
FIG. 11 shows a fifth embodiment of a pulley with a bearing according to the present invention, wherein an inner peripheral surface of the inner cylindrical portion, a bearing outer ring and a bearing outer ring when a bearing outer ring is fitted to the inner cylindrical portion of the pulley. It is a figure which shows the contact state of.
FIG. 12 shows a sixth embodiment of a pulley with a bearing according to the present invention, and is a view seen from the same direction as a cross-sectional view taken along the line BB of FIG. 6 (A).
FIG. 13 is a partial sectional view in the axial direction of a pulley constituting a conventional pulley with a bearing.
14 (A) is a partial sectional view in the axial direction of a pulley constituting a conventional pulley with a bearing, and FIG. 14 (B) is a partial perspective view showing an inner peripheral surface of the pulley 15;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pulley with a bearing 2 Pulley 21 Outer cylindrical part 22 Annular disk part 23 Inner cylindrical part 23a Inner cylindrical part inner peripheral surface 23b Concave groove 23c Base 23d Convex ridge 23e Concave groove 23f Waveform 24 Flange part 3 Bearing 31 Bearing outer ring 4 Pulley 41 Outer cylindrical part 42 Annular circular disk part 43 Inner cylindrical part 5 Metal plate 5a Inner peripheral surface 5b of metal plate cylindrical part 5c Flange part 5c Metal plate cylindrical part 5d Flange part 5e Concave groove 5f Base part 5g Convex part 5h Concave shape Groove 5i Waveform

Claims

A pulley provided with a pulley integrally including an outer cylindrical portion serving as a belt transfer portion, an inner cylindrical portion, and an annular disk portion connecting them, and a bearing fitted to the inner peripheral surface of the inner cylindrical portion. ,
The outer cylindrical portion, the inner cylindrical portion and the annular disk portion connecting them are made of sheet metal, and a plurality of axially extending concave grooves or ridges are formed in the inner circumferential surface of the inner cylindrical portion. Characterized pulley with bearing.

A pulley provided with a pulley integrally including an outer cylindrical portion serving as a belt transfer portion, an inner cylindrical portion, and an annular disk portion connecting them, and a bearing fitted to the inner peripheral surface of the inner cylindrical portion. ,
The outer cylindrical portion and the inner cylindrical portion serving as the belt transfer portion and the annular disk portion connecting them are integrally formed with synthetic resin, and from the side end surface of the outer cylindrical portion through the side end surface of the annular disk portion. A shaft, wherein a metal plate is integrally formed on the inner peripheral surface of the inner cylindrical portion, and a plurality of concave grooves or ridges extending in the axial direction are formed on the inner peripheral surface of the inner cylindrical portion of the metal plate in the circumferential direction. Reception pulley.

A side end surface of a bearing is provided on a metal plate integrally formed on the inner peripheral surface of the inner cylindrical portion from a side end surface of the outer cylindrical portion of the synthetic resin through a side end surface of the annular disk portion, opposite to the annular disk portion. The pulley with a bearing according to claim 2, wherein a flange is formed so as to cover the pulley.